EP2150896A1 - Method for memory management - Google Patents
Method for memory managementInfo
- Publication number
- EP2150896A1 EP2150896A1 EP08773257A EP08773257A EP2150896A1 EP 2150896 A1 EP2150896 A1 EP 2150896A1 EP 08773257 A EP08773257 A EP 08773257A EP 08773257 A EP08773257 A EP 08773257A EP 2150896 A1 EP2150896 A1 EP 2150896A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- memory
- data
- storage medium
- storage
- stored
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F12/00—Accessing, addressing or allocating within memory systems or architectures
- G06F12/02—Addressing or allocation; Relocation
- G06F12/0223—User address space allocation, e.g. contiguous or non contiguous base addressing
- G06F12/023—Free address space management
- G06F12/0238—Memory management in non-volatile memory, e.g. resistive RAM or ferroelectric memory
- G06F12/0246—Memory management in non-volatile memory, e.g. resistive RAM or ferroelectric memory in block erasable memory, e.g. flash memory
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2212/00—Indexing scheme relating to accessing, addressing or allocation within memory systems or architectures
- G06F2212/10—Providing a specific technical effect
- G06F2212/1032—Reliability improvement, data loss prevention, degraded operation etc
- G06F2212/1036—Life time enhancement
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2212/00—Indexing scheme relating to accessing, addressing or allocation within memory systems or architectures
- G06F2212/72—Details relating to flash memory management
- G06F2212/7211—Wear leveling
Definitions
- the present invention relates to the preamble claimed and is thus concerned with the management of memory.
- the object of the present invention is to provide new products for commercial use. Preferred embodiments can be found in the subclaims.
- the present invention thus proposes, in a first basic concept, a method for memory management in which memory usage data related to the use of the memory is stored, in which it is provided that the memory usage data is processed in response to a number of memory write and / or write memory data. read accesses.
- the present method contributes to increasing the reliability of memory usage, and it is particularly preferable to use it as a reliability-enhancing method as well.
- the number of memory write and / or read accesses to be determined in response to which memory usage data can, on the one hand, detect a temporal number density, ie signal a particularly high degree of memory utilization, if very short readings of the memory are read or accessed in succession.
- the number of memory write and / or read accesses in response to which the memory usage data are determined means the integral amount of write and / or read accesses, for example by specifying an absolute number of write or read accesses, which makes sense for hard disks, for example because often, especially in less used storage, where only sporadically data must be stored, the otherwise idle hard drive must be re-driven, which leads to a particularly large burden.
- the number of read and / or write accesses will be weighted to include the amount of data written and / or read in determining the number, such as the total amount of data written since the memory usage data was acquired and / or read.
- the memory usage data it is possible, and in such a case preferable, to relate the memory usage data to a number of memory accesses of read or write type known to be maximally allowable. It is obvious that, as a maximum admissible memory access numbers known must be determined statistically and insofar as a monitored single memory may have a behavior that may differ significantly from the statistically observed mean behavior of memories of the same type. However, it is possible to relate the memory usage data to such a number, for example in the form of a percentage of memory wear.
- the typical failure behavior of memories can also be taken into account, for example, by ensuring first in a storage medium formatting that no initial failures occur (so-called "child mortality" electronic or other devices) and that thereafter, if, for example, when formatting recognized no errors a number of memory accesses are used, in which, depending on the security needs of the storage user, for example, 95 or 99% of all storage media still function correctly. The number can then be recorded, for example, by specifying a percentage of wear.
- the memory usage data relating to the number of memory write and / or read accesses can and should preferably be stored on the storage medium itself.
- the method for removable media is particularly preferred. This initially applies to all types of removable media, because it will be clear that magnetic memories or optical disks to be written several times can not be rewritten indefinitely. Nevertheless, the method is also particularly useful for electronic memories such as USB sticks and / or flash memories, since these are often used when data must be transferred in critical situations such as lectures or so. Therefore, the method is particularly preferred here. Furthermore, it is possible to store the usage data of the removable medium on a device using the memory, preferably together with an identifier of the removable medium.
- the usage data may be stored in a memory such as an EEPROM; This is advantageous because such a power failure safety is guaranteed.
- a threshold value when a threshold value is exceeded, an indication is generated and / or further storage of data on the medium is prevented.
- an indication generation when the threshold is exceeded it is also possible to display or generate information about the usage status continuously or on request or the like. This can be z. B. by a bar display (LCD bar, etc.).
- note generation and reinstatement suppression will depend on how critical the receipt of the data actually is and if any indications can be communicated immediately. This is the case, for example, with network-connected cameras, which can automatically establish a connection in order to send warnings to an adapter. ministrator or the like, or to communicate permanently over a network.
- Such an indication may, for. B. as an SMS signal, as an email, via pagers, etc., but also visually, z. Eg by flashing LED on the device or in its vicinity or a control panel.
- Protection is also claimed for the operation of a device such that the method is carried out and for drivers for operating a storage medium according to one of the described methods. At the same time, protection is claimed for data carriers on which such drivers are stored. Protection is further claimed for storage media having a storage area in which data generated by the method are stored, and protection is claimed for devices having a capability of using a removable storage medium used in the method of the invention.
- Fig. 1 is a diagram of the execution of the method.
- Device 1 is designed to provide data for a memory 2, wherein it is designed such that storage data #W (n) related to the use of the memory is likewise provided for the memory 2, this memory usage data being responsive to a number of memory write - and / or read accesses are to be determined.
- the device 1 is a surveillance camera that continuously stores monitoring data in the memory 2.
- the memory 2 is a USB stick whose storage capacity is sufficient to be able to record the image data from the monitoring camera 1 for a certain monitoring period such as, for example, one week without changing the storage medium and without overfilling the memory.
- the camera 1 is designed to overwrite the oldest image data on the USB stick after one week.
- the USB stick as known per se with electronic removable storage media, is designed to transparently distribute the data to be stored uniformly to the user in blocks so that as far as possible all the blocks are used as uniformly as possible.
- the memory blocks provided for the storage of image data to be recorded are designated in FIG. 1 by Bl to BN.
- a memory block BO in the USB memory 2 is now reserved, in which a number #W is stored, which is indicative of the total number of write accesses to the storage medium 2. It is further provided a stage 3, which can be realized in particular by the operating system of the camera 1, in which the amount of data currently to be stored #Data to the total amount of data previously are stored on the USB stick, #W (nl), are added to obtain a current total size #W (n) of total data written on the USB flash drive 2 since the start of acquisition of storage usage data.
- the number #W (n) related to the total number of memory write and / or read accesses is in this case compared with a maximum measure W ma ⁇ , which indicates how large, statistically, the number of memory accesses can be before errors due to memory wear.
- a warning indicated at 3a
- the updated measure of the integral memory usage #W (n) can be stored as new memory usage data in block BO.
- the warning indicated at 3a can be stored on the storage medium in order to be optionally read out with data as soon as a user removes the data from the USB stick and / or that a remote maintenance can be requested , Alternatively, a warning can be generated by the way when reading the memory.
- the invention is used as follows: When a new USB or other removable mass storage is connected to the device 1, first the storage medium is initialized by writing a memory ID to the memory block BO and noting that the number of write accesses #W (0) detected for that medium is identical is equal to zero. After this initialization, the device 1 is put into operation and it is started with the storage of data on the USB stick. With each data block that is to be transferred to the USB stick and stored, the previous number of memory accesses #W (nl) that have already been made is updated by reading this number out of block BO and adding to this number the size of the current memory to be written data block #Data is added.
- the obtained result #W (n) which is indicative of the current total amount of write accesses already made on the USB stick, is then written to the block BO by overwriting the previous result #W (nl).
- the data is transferred to the blocks B1 to BN. It should be noted that insofar as increased wear is to be expected there due to the regular access to the block BO, the per se known distribution of data to physical memory blocks can also detect the block BO. In this respect, it is not absolutely necessary that the memory usage data must be regularly physically written to the same memory location so that there is no more frequent access than at other memory locations.
- USB Stick will either already have an identifier ID in the block BO and also contain the number of previously stored on the exchanged USB flash drive in previous memory data blocks, so that the former value #W (nl) for the replaced USB stick at each intervention Data can be updated or the replaced USB stick has not yet been used on a surveillance camera and therefore has no corresponding identifier, so this is to create as indicated above by initialization.
- USB stick has not been used significantly before, which is typically uncritical because, especially in continuous operation, monitoring devices are used intensively on monitoring devices, while otherwise the amount of data that is available from a simple user is approximately stored in office mode on USB sticks, is low at best.
- the previously removed USB stick can then be read out, at the same time reading a measure of its wear on the read-out device, for example a laptop brought to the camera, in order to decide on the continued use of the memory.
- a measure of its wear on the read-out device for example a laptop brought to the camera
- the display it is also possible for the display to be provided on the USB stick itself, for example in LCD form or the like, which automatically responds during operation.
- USB-internal microcontrollers may suffice, which only have the value #W in the block BO against the value W max which is produced for the USB stick.
- - II - is determined by the operator or the user, compare to activate a warning or a bar graph display.
- usage data stored cyclically in the address space can be additionally stored in a consecutive manner after each data block or data stream. From these, then the total use can be obtained. By preferably cyclically traversing the address space and the storage position of the usage data is changed. Especially with a known size of data to be written off, the usage data need not be readjusted.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP13000706.5A EP2597574B1 (en) | 2007-05-18 | 2008-05-19 | Method for memory management |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007023408A DE102007023408A1 (en) | 2007-05-18 | 2007-05-18 | Method for memory management |
PCT/DE2008/000825 WO2008141616A1 (en) | 2007-05-18 | 2008-05-19 | Method for memory management |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13000706.5A Division EP2597574B1 (en) | 2007-05-18 | 2008-05-19 | Method for memory management |
EP13000706.5A Division-Into EP2597574B1 (en) | 2007-05-18 | 2008-05-19 | Method for memory management |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2150896A1 true EP2150896A1 (en) | 2010-02-10 |
EP2150896B1 EP2150896B1 (en) | 2018-02-28 |
EP2150896B8 EP2150896B8 (en) | 2018-07-25 |
Family
ID=39769162
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08773257.4A Not-in-force EP2150896B8 (en) | 2007-05-18 | 2008-05-19 | Method for memory management |
EP13000706.5A Not-in-force EP2597574B1 (en) | 2007-05-18 | 2008-05-19 | Method for memory management |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13000706.5A Not-in-force EP2597574B1 (en) | 2007-05-18 | 2008-05-19 | Method for memory management |
Country Status (4)
Country | Link |
---|---|
US (1) | US9053006B2 (en) |
EP (2) | EP2150896B8 (en) |
DE (1) | DE102007023408A1 (en) |
WO (1) | WO2008141616A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100964374B1 (en) * | 2007-12-17 | 2010-06-17 | 한국전자통신연구원 | Device and Method for Managing Memory in RFID Tag |
CN102902627B (en) * | 2011-07-28 | 2015-12-09 | 比亚迪股份有限公司 | A kind of memory identification method of datalogger |
CN107506135B (en) * | 2016-06-14 | 2022-05-06 | 杭州海康威视数字技术股份有限公司 | Data processing method, device and system |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0750558B2 (en) * | 1992-09-22 | 1995-05-31 | インターナショナル・ビジネス・マシーンズ・コーポレイション | Batch erasable non-volatile memory |
US5956743A (en) | 1997-08-25 | 1999-09-21 | Bit Microsystems, Inc. | Transparent management at host interface of flash-memory overhead-bytes using flash-specific DMA having programmable processor-interrupt of high-level operations |
US5822251A (en) | 1997-08-25 | 1998-10-13 | Bit Microsystems, Inc. | Expandable flash-memory mass-storage using shared buddy lines and intermediate flash-bus between device-specific buffers and flash-intelligent DMA controllers |
US6000006A (en) * | 1997-08-25 | 1999-12-07 | Bit Microsystems, Inc. | Unified re-map and cache-index table with dual write-counters for wear-leveling of non-volatile flash RAM mass storage |
US6487631B2 (en) | 1999-02-02 | 2002-11-26 | Qlogic Corporation | Circuit and method for monitoring sector transfers to and from storage medium |
GB0123410D0 (en) | 2001-09-28 | 2001-11-21 | Memquest Ltd | Memory system for data storage and retrieval |
US7330954B2 (en) * | 2002-04-18 | 2008-02-12 | Intel Corporation | Storing information in one of at least two storage devices based on a storage parameter and an attribute of the storage devices |
US20040233282A1 (en) * | 2003-05-22 | 2004-11-25 | Stavely Donald J. | Systems, apparatus, and methods for surveillance of an area |
JP4357304B2 (en) * | 2004-01-09 | 2009-11-04 | 株式会社バッファロー | External storage device |
US20060031626A1 (en) * | 2004-08-03 | 2006-02-09 | Endress + Hauser Gmbh + Co. Kg | Field device for automation technology |
US7363421B2 (en) * | 2005-01-13 | 2008-04-22 | Stmicroelectronics S.R.L. | Optimizing write/erase operations in memory devices |
US20070083697A1 (en) | 2005-10-07 | 2007-04-12 | Microsoft Corporation | Flash memory management |
-
2007
- 2007-05-18 DE DE102007023408A patent/DE102007023408A1/en not_active Withdrawn
-
2008
- 2008-05-19 US US12/600,753 patent/US9053006B2/en not_active Expired - Fee Related
- 2008-05-19 EP EP08773257.4A patent/EP2150896B8/en not_active Not-in-force
- 2008-05-19 WO PCT/DE2008/000825 patent/WO2008141616A1/en active Application Filing
- 2008-05-19 EP EP13000706.5A patent/EP2597574B1/en not_active Not-in-force
Non-Patent Citations (1)
Title |
---|
See references of WO2008141616A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP2597574A1 (en) | 2013-05-29 |
DE102007023408A1 (en) | 2008-11-20 |
EP2597574B1 (en) | 2017-12-20 |
US9053006B2 (en) | 2015-06-09 |
US20100293318A1 (en) | 2010-11-18 |
EP2150896B8 (en) | 2018-07-25 |
WO2008141616A1 (en) | 2008-11-27 |
EP2150896B1 (en) | 2018-02-28 |
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